Mechanical pencil



Jan. 8, 1929. 1,698,445

Y. MORlTA MECHANICAL PENCIL Filed Nov. 10, 1925 at: an

Patented Jan. 8, 1929.

UNITED STATES YENJ'IRO EORITA, 0F ADZUMA-MACHI; NEAR TOKYO, JAPAN.

MECHANICAL PENCIL.

Application filed November 10, 1925. Serial No. 68,198.

This invention relates to a mechanical pencil or a sharp pencil, and more particularly to the inner tubular member and lead holding jaws containing a push rod.

An object of the invention is-to provide a superior mechanical pencil which may be manufactured by a simple manner and with a minimum material and consequently at a lower cost.

In order that this invention may be clearly understood and readily carried into practice, reference may be had to the appended explanatory sheet, of drawings in which:

Fig. 1 is a plan view showing three pairs of blanks for inner tubular members out from a sheet metal,

Fig. 2 is aside View of the inner tubular member formed by joining together a pair of semi-tubular members out from a sheet metal in the manner shown in Figure 1,

Fig. 3 is a longitudinal section of a completed mechanical pencil made according to this invention.

Referring to the drawings, the inner tubular member shown in Figure 2 consists of a larger sleeve portion 1, reduced central portion 2, and a further reduced portion or lead holding jaws 3, and is made of a pair of blanks out out from. a sheet metal as shown in Figure 1, each blank being bent to a semi-tubular shape so as to form "a tubular member when joined together. The portions 1, 2 and 3 form an integral body. In each blank there is provided a slot 4 in the central portion 2, and there is also provided another slot 5 in the larger portion. These slots 4 and 5 are preferably out at the same time of cutting the blanks from a sheet metal by means of a punching press.

As shown in Figure 3, collars 6 and 7 are mounted on the both ends of the central portion 2, whereby the pair of the semitubular members is securely held. At the same time, a spiral wire 8 is mounted around the central portion2, and surrounding the same is mounted a sleeve 9. Into the central portion 2 is inserted a push rod 11 having a forked engaging member 10 Which extends through'the slot 4 and is engagedby the spiral wire 8, thus forming a lead 1 propelling device. The extreme ends of the reduced portions 3 are slightly bent outwardly so that when they are introduced into the barrel 12, coming into contact with the inner surface of the conical part, they serve to hold the lead firmly. A lead magazine 13 is frictionally held inserted into the larger end of the inner tubular member,

, invention the inner tubular member including spring jaws is formed by joining together a pair of semi-tubular members which are cut'out from a sheet metal,and

they are securely held by means of collars 6 and 7, without a necessity of soldering. So, according to this invention, improved mechanical pencils may be manufactured with a lower cost, requiring a minimum amount of skill and labor.

What I claim is: a

A mechanical pencil composed of a barrel, an inner tubular member having integral therewith lead holding jaws, said member comprising a pair of semitubular members, a collar on said inner tubular member and securin said semitubular members together, a spiral wire surrounding the central portion of the inner tubular member and bearing against said collar, and a push rod having an engaging member extending through a slot formed in said central portion and engaging the said spiral wire, and a sleeve 'in said barrel and surrounding said spiral 

